import java.util.*;
import java.util.Map;
import java.util.HashMap;
import java.util.Scanner;

public class Solution {
    public int climbStairs(int n) {
        // 请在此处实现你的算法
        return 0;
    }

public static void main(String[] args) {
    if (args.length >= 1) {
        int n = Integer.parseInt(args[0].trim());
        Solution solution = new Solution();
        int result = solution.climbStairs(n);
        System.out.println(result);
    }
}
}